Title: Analysis of the continuous mode conversion of Lamb waves in fiber composites by a stochastic material model and laser vibrometer experiments
Authors: Zimmermann, Eugen 
Eremin, Artem 
Lammering, Rolf  
Affiliation: Mechanik
Kuban State University, Krasnodar
Mechanik
Language: en
Subject (DDC): Ingenieurwissenschaften
Subject: Carbon Fiber Reinforced Plastic
Dispersion
Stochastic Model
Issue Date: 2018
Publisher: Wiley-VCH
Document Type: Article
Journal / Series / Working Paper (HSU): GAMM Mitteilungen 
Volume: 41
Issue: 1
Abstract: 
The complex internal structure of modern laminate composite materials, for example, carbon fiber reinforced plastics (CFRP), has a pronounced influence on the propagation of elastic guided waves (GWs). Along with the well-known anisotropy-conditioned amplitude and dispersion directivity of source-induced wavefields and their remarkable attenuation due to the polymer matrix viscosity, continuous mode conversion (CMC) of GWs in multilayered composites fabricated from unidirectional prepregs has been recently observed experimentally. The latter means that the symmetric fundamental mode continuously converts into the antisymmetric one without passing a damage, that is, even in an intact structure. Being strongly related to the inhomogeneous CFRP microstructure and possessing remarkable intensity for specific propagation directions, this phenomenon should be accounted for in ultrasonic nondestructive testing and structural health monitoring systems. In this work, we investigate the CMC phenomenon in an important class of laminates, namely cross-ply ones, experimentally as well as numerically. In the computational model it is addressed through the concept of spatially varying material properties, and the finite element method (FEM) is employed for the GW propagation simulation. Experimental measurements are performed for piezoelectrically excited GWs with scanning laser Doppler vibrometry technique, allowing clear visualization of the CMC phenomenon and confirming theoretically predicted dependence of its intensity from propagation direction. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Organization Units (connected with the publication): Mechanik 
ISSN: 0936-7195
DOI: 10.1002/gamm.201800001
Rights: 4.0 deutsch
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